<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <div class="content">
    <button>按钮</button>
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  <body>
    <script>
      const content = document.querySelector('.content')
      const btn = document.getElementsByName('button')
      content.addEventListener('click', function (e) {
        console.log(e.target)
        console.log(e.currentTarget)
      })
    </script>
  </body>
</html>
